Just swapping too Zee's with the RT86 disks and the shimano 180 to 203 adaptors (about €5 each - bike discount.de).
Only changed the rear caliper so far and it's chalk and cheese compared to the SRAM rim break emulation system.
I think the XT's are XT levers and saint calipers - but might be wrong ?
I think the decision depends a lot on your priorities ..
Want Pretty - Hope - no questions.
Want something that works and parts are easy to get - Shimano.
I was stuck on the hope fence for quiet a while ..
adapters :
Shimano SM-MA-F203P/PM Adapter Front (180mm) to 203mm | Disc Adaptors Shop
Rotors :
Shimano XT SM-RT86 6-hole Disc Rotor 203mm | Brake Rotor Discs Shop
Zee front and rear with H03C metals :
Shimano ZEE BR-M640-B Disc Brake Set with H03C Metal | Disc Brake - Sets Shop